Clarence b



Sept. 28 1926.

c. R. CALLAWAY ELEVATOR CONTROL MECHANISM Filed March 51, 1922 47TORNEV e hanism.

Patented Se t. 2s, 1926.

UNITED "sreres rename CLARENCER. QALLAWAY, or Lone elic a, new YORK, ASSIGNOIt To Gummy ELE- VA'IOB ooMr'An PENNSYLVANIA. 7

me, 013 HoNEsnALE, rENnsY v NIA, A conrormm on or ELEVATOR-CONTROL MECHANISM.

' hpplicationfilefl March 31 1922. Serial No. 548,288.

This invention relates to elevator. control The invention more particularly pertains to the type of elevator control in which the stopping of the, elevator car is automatically controlled through a floor limit device it is assumed that the load on the elevator I operating means. for the control device in by; the position of the car.

e m thl of W l l g ou suc a c trol system involves the use of a connection between thefloor limit devi'ceand a fixed point on the elevator car or othermechanism -for actuating the floor limit devicedependent on'the actual position of the elevator car in its travel.

With such a structure, however, it has been found thatthe different weights carried bythe elevator car will cause the car to stop short of or pass the floor landing.

This invention has for its object to provide an elevator control constructed and,

a g d t mpe sate au omatically for variations in the weight .of the load carried by the elevator ,car thereby insuringthe stopping of the elevator at the desired level.

Further objects of the invention will aptpear from the following specification taken in connection with the drawings which form a part of this application andin which Fig. 1 is a diagrammatic view showing in elevation a representation of an elevator car and a controldevioe and the connections for operatingthe control device. In this view is normal, a

Fig. 2 is a diagrammatic view similar to Fig. v1 but showing a load on the elevator less than the normal load and illustrating the the position taken with less thana normal load on the elevatorand I Fig. 3 is a di'agrammatic view similar to Figs. land 2 but showing the elevator carw ,rying'a load heavier than normal'and illustrating the parts in the position. taken-when operatingwithaheavy load, i f a The invention, maybe briefly dfisoiibed as eonsisting of adjustable .rneans connected to the control device and automatically all:

' justable with, respectthereto by the variatheillustrations in thed rawin tions in the load carried by the elevator car.

. he o -se s o l be 11nd f eely tood that theprinciple of the invention rather than the actual structural details of elevator controlmechanism. i 1

Referring to the drawings, I have shown PATENT oFF-lcE. Y

an elevator car 10, suspended from hoisting I ab es 11'. A pl te l21is secured t th ends operating andaCtuating means forthe control device aboutto be described will assumeunder operating conditions with the normal load 16, the relative positions shown in Fig.1. A, control device, known in the art, as a floor limit device is shown diagrammatically at 17 ,and this device is operated by means ofan endless cable 18 hich p s s at. its. pper end arou d a sheave l9 and at its lower end around a sheave 20 to which is, secured a'weight 21 for the purpose of maintaining the cable 18 taut.

As is well known the purpose of the con trol device. 17 O1 floor limit device is tostop the car at the desired floor or level when the operator has actuated the electric push buttons or other suitable mechanism for setting in operation the control device. However, it has been found that although such operating meansis'satisfactory when the carhas a normal load, this mechanism alone is not suficient to stop thecar at the proper level whenthe weight carried by the ca'ris lessthan or greater than'the weight of the norm l lo d, ,F rfex m'p' e, h the c ism-king n up tr p nd th eig o t bedis less th nn rma' l' the arfwill t p aboveithe floor level and n theldown rip under the same load onditions theqar will. s ophefoie itre ehes he loo le l.- When the we gh at t "lead, s greater han el: 1 31 thelcar" will top be the lo r eve both on the up and down trips,

In or er teote e m t d f icu Provided ppm: r the eoe rol or fioorli" it d position with ty '1 have carried by the car. This means comprises an arm or lever 22 shown in the particular embodiment of the invention as pivoted at 23 to the car and having one end 24: connected to the cable 18 and its other end 25 connected by a rod 26 to the plate 12. A dash pot 27 isconnected by a link 28 to the arm 22 to steady the arm and to dampen the fluctuations or movements of the arm about the pivot 23.

From the showing in Fig. 1, it will be seen that the arm 22 is substantially horizontal when a normal load 16 is carried by the car.

hen, however, theload is less than nor mal as shown in Fig. 2, the plate 12 will be spaced a greater distance from the cross member 15 of the car or in other words the springs M will lift the car on the cables or rods 13. This will cause the arm 22 to swing on its pivot 23 to the position shown in Fig. 2 thereby advancing the actuation of the floor limit device through an angle which may be diagrammatically represented as the angle a in Fig. 2.

hen the load carried by the car is greater than normal as shown in Fig. 8, the springs l l willbe compressed and the plate 12 will approach the frame member 15 and the car thereby swinging the arm 22 downwardly about its pivot to a position such as that show in Fig. 3. This will delay the actuation of the control device thereby insuring the stopping of the car at the desired floor level. The delay in the actuation of the floor limit device may be represented by an angle such as the angle 7) in Fig. 3.

Thus it will be seen that the control de vice is actuated sooner on the up trip and later on the down trip, with a light load and with a heavier than normal load the device will be actuated later on the up trip and sooner on the down trip.

From the above description it will be seen that simple and practical means has'been provided for controlling the actuation of an elevator control or floor limit device in such a manner as to compensatefor the varia tions in the weight of the load carried by the car and to insure the stopping oi the car at the-desired level.

Although for the sake-of illustrating one.

tion as expressed in the following claims.

What I claim is V 1. In combination, a floor limit control device for an elevator, an elevator car, hoisting means connected thereto and means connected to said hoisting means, to the car and to the floor limit device for automatically compensating for variations in the weight of the load on said hoisting means. 4

'2. In combination, a floor limit control device including a sheave and a cable for an elevator, an elevator car, hoisting means connected thereto, and means connected to said hoisting means, to the car and to the cable of the floor limit device for automatically compensating for variations in the weight of the load on said hoisting means.

8. In combination, a floor limit device for elevator cars, an elevator car, operating means for said device including a cable, a lever pivoted on the car and connected to said cable, hoisting means for the car and compensating means between the lever and hoisting means whereby the actuation of the limit device is advanced or delayed as the weight of the load on the car is increased or decreased with respect to a predetermined weight.

4-. In combination, a floor limit elevator stopping device, an elevator car and operating means for said device, including a lever pivoted on said car, and a cable connected to said lever and operatively connected to said stopping device constructed and arranged to advance or delay the actuation of the device as the weight of the load on the car is decreased from or increased over a predetermined weight.

5. Elevator control mechanism comprising a floor limit control device and operating means for said device including a cable and pivoted means on said car automatically adjustable by the weight of and the weight carriedby the elevator car to compensate for the variations in weight and insure the stopping of the elevator carat the desired level, said pivoted means being connected to said cable.

6.. Incombination, a floor limit device for elevator cars, an elevator car, operating means for said device including a sheave geared to said limit device, an endless cablepassing over said sheave, a lever pivoted on the elevator car and connected to said cable, hoisting means for the car and compensating means between the lever and hoisting means wherebyactuation of the limit device is advanced or delayed as the weight or" the load on the car is increased or decreased with respect to a predetermined weight. 7

7. An elevator car, a hoisting line yieldably connected to the car, and mechanism providing landing stops for the car and including a control drum, a line therefrom, and a lever connected to the lines and car.

8. A car, a hoisting line for the car yieldably connected to the car, a control line, and a hoisting line influenced connection for the control line to the car;

9, A car, a' hoisting line yieldably confit nected to the car for actuating the car, and a control line connected to the hoisting line.

10; A car, a hoisting line for the car yieldably connected to the car, a lever connected to the car and the hoisting line, and a control line connected to the lever.

11; A cer, a hoisting line for the car yield ably connected to the car, a lever connected to the car and a control line, said lever having one arm connected to the hoisting 10 line and a second arm connected to thecontrol line, and said arms proportioned to affeet the control line as the momentum due to car load changes is varied.

In Witness whereof, I have hereunto set v 

